14 

 USNEA EASCIATA. 



Cryptogamia Lichenes. Nat. Ord. Lichenes. 



Gen. Char. Apotliecia orbiculata, terminalia, peltata, a thallo for- 

 mata ejusque substantia cortical! similari undique obtecta, am- 

 bitu immarginato, plerumque ciliato. Thallus subcrustaceus te- 

 retiusculus ramosus substantia elastica filiformi hyalina centrali 

 percussus. — Ach. 



Usneajasciata ; ramosissima tuberculato-scabra flavo-virescens, ramis 

 repetitim dichotomis proliferis saepissime nigro-fasciatis ultimis 

 lateralibusque numerosissimis capiliaceo-attenuatis, apotheciis he- 

 mispliEericis nudis brunneis extus tuberculatis. (Tab. XI.) 



Usnea fasciata. Torrey in Silliman^s American Journ. of Sc. v. 6. cum 

 ic. {absq. apotheciis.) 



Hab. In rupibus antarcticis Novae Zetlandiae meridionalis. — In Nova 

 HoUandia, locis alpinis ? 



TJiallus csespitosus, erectus, 3 — 4-uncialisj erectus, ramosissimus, flavo- 

 virescens, ramis repetitim dichotomis magis minusve tuberculoso- 

 scabridis atque proliferis, raraulis minutis gracilibus simplicibus 

 filiformi-attenuatis vel ramosis subhorizontalibus, e latere egredi- 

 entibus, ramis ultimis saepe nigro-fasciatis attenuatis. Apothecia 

 terminalia peltata, primum parva, globosa, demum hemisphaerica, 

 semiunciam diametro, intus fusca, extus e thallo formata, minute 

 tuberculata. 



W. Edwards, Esq., who accompanied in a medical capacity 

 the first and second expeditions sent to discover a north-west 

 passage, was so obliging as to procure the fine specimen here 

 represented of the antarctic Usnea, on which some observa- 

 tions will be offered under the following species. 



Fig. 1. Plant {nat. size). Fig. 2. Portion: — magnified. 



